Rinse the 5 ml test tube three times with the sample to be tested.
Fill the test tube to the 5 ml line.
Add 1 drop of Molybdenum Reagent 1 (WR 8280).
Cap and invert the tube several times to mix the reagent.
Add 3 drops of Molybdenum Reagent 2 (WR 8281).
Cap and invert the tube several times to mix this second reagent.
Insert the tube into the comparator block and hold the block against a white surface illuminated by a fluorescent lamp. Move the slide back and forth until the closest colour / intensity match is found.
NB Do not hold the sample directly above your eyes.
Record the value beneath the colour match and multiply by 0.6 to convert the reading to ppm Mo.
Example: if the colour comparison indicates 180 ppm, multiply this value by 0.6 and record it as 108 ppm Mo. The block indicates Molybdate (MoO4), multiplying by 0.6 converts the Molybdate reading to Molybdenum (Mo).
Download this testing procedureTOP
Phosphonate Dropper Titration Method
Rinse the sample test bottle three times with water to be tested. Fill to the 8.3-ml sample line.
Add 1 drop of Sodium Thiosulfate (reagent WR 8261) to consume any chlorine present in the sample. Swirl to mix.
Add 5 drops of Fluoride Inhibitor (reagent WR 8260) to consume any Fluoride in the water. Swirl to mix.
Add 1 level dipper (0.1 gram) of 'XO' Indicator (reagent WR 8262). Swirl until powder is dissolved.
An accurate test end point is achieved when the pH of the sample if between 2.5 to 3.0. This is accomplished with the 1.0 N Hydrochloric Acid (reagent WR 8259).
Slowly add 1.0 N Hydrochloric Acid, one drop at a time, while swirling until the sample turns to a yellow colour. Add 1 additional drop of 1.0 N hydrochloric Acid.
While swirling the sample, add Thorium Nitrate (reagent WR 8263) one drop at a time.
Add the drops slowly allowing time for any colour development, until the first, definite pink colour is achieved.
Let the sample sit for up to one minute, adding a further drop if the pink colour reverts to orange/yellow.
The first, stable pink colour is the end point. The test result is expressed as the number of 'DROPS OF REAGENT WR 8263'.
Download this testing procedureTOP
Sulfite 50 ml Sample
Measure 50 mls of sample to be tested into a clean beaker or flask.
Add 0.6 grams (i.e. 2-3 scoops) of Sulfamic Acid Powder (reagent WR 8276). Stir sample to mix. Confirm that no 'P' Alkalinity is present by adding 2 - 5 drops of WR 8226 (Phenolphthalein Indicator). Add additional WR 8276 if any red colour is present in sample.
NB If the presence of 'P' Alkalinity is discounted after the addition of the acid powder (and if the boiler alkalinity does not increase significantly), this step can usually be omitted from future procedures.
Add 10 to 15 drops of Starch Indicator Solution (reagent WR 8278). Stir sample to mix.
Slowly add N/63 Potassium Iodide Iodate (reagent WR 8284) to the sample while stirring, until a permanent, faint blue colour is noted. This is the end-point.
Ppm sulfite is determined by multiplying the number of mls of WR 8284 used, by 20.
Measure 10 ml of sample to be tested into a clean test bottle (fill to line).
Add 3 drops of Ferroin Indicator (reagent WR 8289) and swirl to mix. An orange colour will develop.
Add C.A.N. Solution (reagent WR 8288) drop-wise, using the syringe in the kit, until the colour turns from orange to a permanent light blue.
NB The end-point is typically a light blue colour but some system waters may not develop a distinct blue. In these instances, identify the end point as the point of transition between the orange colour and a colourless to pale yellow solution.
Record the number of mls of WR 8288 added to the sample to the nearest 0.1-ml.
Multiply the number of mls of reagent WR 8288 by 250 to determine ppm in the sample.
Measure 50 mls of sample to be tested into a clean beaker or flask.
Add 10 drops of reagent WR 8226 (Phenolphthalein Indicator) and swirl to mix. If 'P' Alkalinity is present, sample will be red in colour (indicating a pH greater than 8.3).
Fill the syringe or burette to the upper mark with N/50 sulfuric acid (reagent WR 8225). Slowly add the WR 8225 to the sample, while stirring, until the red colour disappears.
Record the number of mls of reagent WR 8225 added to the sample and multiply by 20 to obtain ppm 'P' Alkalinity (put the syringe or burette aside for Step #5 if M Alkalinity is being determined).
Add 10 drops of Methyl Purple to the same sample. A green colour will develop.
Continue adding WR 8225, drop-wise, until the colour turns from green to purple. Allow up to one minute for colour development.
'M' Alkalinity is determined by adding the total volume of WR 8225 used in both the 'P' and 'M' titrations and multiplying the sum by 20.
Example: 25 mls total volume of WR 8225 was used in steps 3 and 5
25 x 20 = 500 ppm total (M) Alkalinity.
NB If only M Alkalinity is being determined, delete steps 2, 3 and 4.
Download this testing procedure
